By David M. Kroenke, David J. Auer
Get instantly to the purpose of database processing. Database Processing displays a brand new educating procedure that will get readers directly to the purpose with its thorough and smooth presentation of database processing fundamentals. The 12th variation has been completely up to date to mirror the newest software program.
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Extra resources for Database Processing: Fundamentals, Design, and Implementation, 12th Edition
You will learn more about such processing in Chapter 11. An interesting phenomenon was the emergence of open source DBMS products. Open source products generally make the source code widely available so that a group of programmers not bound to a single company can contribute to the program. Further, some forms of these products are usually offered as free downloads, although other forms or product support must be purchased from the company that owns the product. com). MySQL was originally released in 1995 by the Swedish company MySQL AB.
This is done in two ways. First, the application needs to be written so that only logical options are presented to the user. For example, the application may generate a menu with user choices. In this case, the application needs to ensure that only appropriate choices Chapter 1 Introduction 11 are available. Second, the application needs to control data activities with the DBMS. The application might direct the DBMS, for example, to make a certain set of data changes as a unit. The application might tell the DBMS to either make all these changes or none of them.
A database is self-describing because it contains a description of itself. Thus, databases contain not only tables of user data, but also tables of data that describe that user data. Such descriptive data is called metadata because it is data about data. The form and format of metadata varies from DBMS to DBMS. Figure 1-13 shows generic metadata tables that describe the tables and columns for the database in Figure 1-3. You can examine metadata to determine if particular tables, columns, indexes, or other structures exist in a database.